Push selection gaps logic down to RenderBlockFlow

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index ed04469141028179c64deffb8eda936dfc6d6913..08f796a806216d8483fe092a76960a62c12063c1 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -2156,11 +2156,11 @@ void RenderLayer::invalidatePaintForBlockSelectionGaps()
 
 IntRect RenderLayer::blockSelectionGapsBounds() const
 {
-    if (!renderer()->isRenderBlock())
+    if (!renderer()->isRenderBlockFlow())
         return IntRect();
 
-    RenderBlock* renderBlock = toRenderBlock(renderer());
-    LayoutRect gapRects = renderBlock->selectionGapRectsForPaintInvalidation(renderBlock);
+    RenderBlockFlow* renderBlockFlow = toRenderBlockFlow(renderer());
+    LayoutRect gapRects = renderBlockFlow->selectionGapRectsForPaintInvalidation(renderBlockFlow);
 
     return pixelSnappedIntRect(gapRects);
 }